Typically I use the contents of somone's posts to gauge their maturity rather than the number of posts. Just because someone has lots of posts does not mean they are mature. I also realize that there are some very mature members who are under 18 so it's not fool proof to analze content.
As far as asking a mod to be a go between, perhaps the mod does not want to give out personal information to so mant other people. A P.O. Box would be possible but then it would cost money to rent it. I think the Mods would also need to be compensated for their time.
I trust that someone someday will figure something out. What do they do at those pin trading web sites?